[linux-2.6-block.git] / drivers / net / can / cc770 / cc770_platform.c

/*
 * Driver for CC770 and AN82527 CAN controllers on the platform bus
 *
 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

/*
 * If platform data are used you should have similar definitions
 * in your board-specific code:
 *
 *   static struct cc770_platform_data myboard_cc770_pdata = {
 *           .osc_freq = 16000000,
 *           .cir = 0x41,
 *           .cor = 0x20,
 *           .bcr = 0x40,
 *   };
 *
 * Please see include/linux/can/platform/cc770.h for description of
 * above fields.
 *
 * If the device tree is used, you need a CAN node definition in your
 * DTS file similar to:
 *
 *   can@3,100 {
 *           compatible = "bosch,cc770";
 *           reg = <3 0x100 0x80>;
 *           interrupts = <2 0>;
 *           interrupt-parent = <&mpic>;
 *           bosch,external-clock-frequency = <16000000>;
 *   };
 *
 * See "Documentation/devicetree/bindings/net/can/cc770.txt" for further
 * information.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/platform/cc770.h>

#include "cc770.h"

#define DRV_NAME "cc770_platform"

MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);

#define CC770_PLATFORM_CAN_CLOCK  16000000

static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg);
}

static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
				     u8 val)
{
	iowrite8(val, priv->reg_base + reg);
}

static int cc770_get_of_node_data(struct platform_device *pdev,
				  struct cc770_priv *priv)
{
	struct device_node *np = pdev->dev.of_node;
	const u32 *prop;
	int prop_size;
	u32 clkext;

	prop = of_get_property(np, "bosch,external-clock-frequency",
			       &prop_size);
	if (prop && (prop_size ==  sizeof(u32)))
		clkext = *prop;
	else
		clkext = CC770_PLATFORM_CAN_CLOCK; /* default */
	priv->can.clock.freq = clkext;

	/* The system clock may not exceed 10 MHz */
	if (priv->can.clock.freq > 10000000) {
		priv->cpu_interface |= CPUIF_DSC;
		priv->can.clock.freq /= 2;
	}

	/* The memory clock may not exceed 8 MHz */
	if (priv->can.clock.freq > 8000000)
		priv->cpu_interface |= CPUIF_DMC;

	if (of_get_property(np, "bosch,divide-memory-clock", NULL))
		priv->cpu_interface |= CPUIF_DMC;
	if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
		priv->cpu_interface |= CPUIF_MUX;

	if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
		priv->bus_config |= BUSCFG_CBY;
	if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
		priv->bus_config |= BUSCFG_DR0;
	if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
		priv->bus_config |= BUSCFG_DR1;
	if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
		priv->bus_config |= BUSCFG_DT1;
	if (of_get_property(np, "bosch,polarity-dominant", NULL))
		priv->bus_config |= BUSCFG_POL;

	prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
	if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
		u32 cdv = clkext / *prop;
		int slew;

		if (cdv > 0 && cdv < 16) {
			priv->cpu_interface |= CPUIF_CEN;
			priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK;

			prop = of_get_property(np, "bosch,slew-rate",
					       &prop_size);
			if (prop && (prop_size == sizeof(u32))) {
				slew = *prop;
			} else {
				/* Determine default slew rate */
				slew = (CLKOUT_SL_MASK >>
					CLKOUT_SL_SHIFT) -
					((cdv * clkext - 1) / 8000000);
				if (slew < 0)
					slew = 0;
			}
			priv->clkout |= (slew << CLKOUT_SL_SHIFT) &
				CLKOUT_SL_MASK;
		} else {
			dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
		}
	}

	return 0;
}

static int cc770_get_platform_data(struct platform_device *pdev,
				   struct cc770_priv *priv)
{

	struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev);

	priv->can.clock.freq = pdata->osc_freq;
	if (priv->cpu_interface & CPUIF_DSC)
		priv->can.clock.freq /= 2;
	priv->clkout = pdata->cor;
	priv->bus_config = pdata->bcr;
	priv->cpu_interface = pdata->cir;

	return 0;
}

static int cc770_platform_probe(struct platform_device *pdev)
{
	struct net_device *dev;
	struct cc770_priv *priv;
	struct resource *mem;
	resource_size_t mem_size;
	void __iomem *base;
	int err, irq;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!mem || irq <= 0)
		return -ENODEV;

	mem_size = resource_size(mem);
	if (!request_mem_region(mem->start, mem_size, pdev->name))
		return -EBUSY;

	base = ioremap(mem->start, mem_size);
	if (!base) {
		err = -ENOMEM;
		goto exit_release_mem;
	}

	dev = alloc_cc770dev(0);
	if (!dev) {
		err = -ENOMEM;
		goto exit_unmap_mem;
	}

	dev->irq = irq;
	priv = netdev_priv(dev);
	priv->read_reg = cc770_platform_read_reg;
	priv->write_reg = cc770_platform_write_reg;
	priv->irq_flags = IRQF_SHARED;
	priv->reg_base = base;

	if (pdev->dev.of_node)
		err = cc770_get_of_node_data(pdev, priv);
	else if (dev_get_platdata(&pdev->dev))
		err = cc770_get_platform_data(pdev, priv);
	else
		err = -ENODEV;
	if (err)
		goto exit_free_cc770;

	dev_dbg(&pdev->dev,
		 "reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
		 "bus_config=0x%02x clkout=0x%02x\n",
		 priv->reg_base, dev->irq, priv->can.clock.freq,
		 priv->cpu_interface, priv->bus_config, priv->clkout);

	platform_set_drvdata(pdev, dev);
	SET_NETDEV_DEV(dev, &pdev->dev);

	err = register_cc770dev(dev);
	if (err) {
		dev_err(&pdev->dev,
			"couldn't register CC700 device (err=%d)\n", err);
		goto exit_free_cc770;
	}

	return 0;

exit_free_cc770:
	free_cc770dev(dev);
exit_unmap_mem:
	iounmap(base);
exit_release_mem:
	release_mem_region(mem->start, mem_size);

	return err;
}

static int cc770_platform_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct cc770_priv *priv = netdev_priv(dev);
	struct resource *mem;

	unregister_cc770dev(dev);
	iounmap(priv->reg_base);
	free_cc770dev(dev);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(mem->start, resource_size(mem));

	return 0;
}

static const struct of_device_id cc770_platform_table[] = {
	{.compatible = "bosch,cc770"}, /* CC770 from Bosch */
	{.compatible = "intc,82527"},  /* AN82527 from Intel CP */
	{},
};
MODULE_DEVICE_TABLE(of, cc770_platform_table);

static struct platform_driver cc770_platform_driver = {
	.driver = {
		.name = DRV_NAME,
		.of_match_table = cc770_platform_table,
	},
	.probe = cc770_platform_probe,
	.remove = cc770_platform_remove,
};

module_platform_driver(cc770_platform_driver);
Commit	Line	Data
e285e44d WG	1	/*
	2	* Driver for CC770 and AN82527 CAN controllers on the platform bus
	3	*
	4	* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the version 2 of the GNU General Public License
	8	* as published by the Free Software Foundation
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	/*
	17	* If platform data are used you should have similar definitions
	18	* in your board-specific code:
	19	*
	20	* static struct cc770_platform_data myboard_cc770_pdata = {
	21	* .osc_freq = 16000000,
	22	* .cir = 0x41,
	23	* .cor = 0x20,
	24	* .bcr = 0x40,
	25	* };
	26	*
	27	* Please see include/linux/can/platform/cc770.h for description of
	28	* above fields.
	29	*
	30	* If the device tree is used, you need a CAN node definition in your
	31	* DTS file similar to:
	32	*
	33	* can@3,100 {
	34	* compatible = "bosch,cc770";
	35	* reg = <3 0x100 0x80>;
	36	* interrupts = <2 0>;
	37	* interrupt-parent = <&mpic>;
	38	* bosch,external-clock-frequency = <16000000>;
	39	* };
	40	*
	41	* See "Documentation/devicetree/bindings/net/can/cc770.txt" for further
	42	* information.
	43	*/
	44
	45	#include <linux/kernel.h>
	46	#include <linux/module.h>
	47	#include <linux/interrupt.h>
	48	#include <linux/netdevice.h>
	49	#include <linux/delay.h>
	50	#include <linux/platform_device.h>
	51	#include <linux/of.h>
	52	#include <linux/can.h>
	53	#include <linux/can/dev.h>
	54	#include <linux/can/platform/cc770.h>
	55
	56	#include "cc770.h"
	57
	58	#define DRV_NAME "cc770_platform"
	59
	60	MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
	61	MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
	62	MODULE_LICENSE("GPL v2");
f190a50c	63	MODULE_ALIAS("platform:" DRV_NAME);
e285e44d WG	64
	65	#define CC770_PLATFORM_CAN_CLOCK 16000000
	66
	67	static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
	68	{
	69	return ioread8(priv->reg_base + reg);
	70	}
	71
	72	static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
	73	u8 val)
	74	{
	75	iowrite8(val, priv->reg_base + reg);
	76	}
	77
3c8ac0f2	78	static int cc770_get_of_node_data(struct platform_device *pdev,
1dd06ae8	79	struct cc770_priv *priv)
e285e44d WG	80	{
	81	struct device_node *np = pdev->dev.of_node;
	82	const u32 *prop;
	83	int prop_size;
	84	u32 clkext;
	85
	86	prop = of_get_property(np, "bosch,external-clock-frequency",
	87	&prop_size);
	88	if (prop && (prop_size == sizeof(u32)))
	89	clkext = *prop;
	90	else
	91	clkext = CC770_PLATFORM_CAN_CLOCK; /* default */
	92	priv->can.clock.freq = clkext;
	93
	94	/* The system clock may not exceed 10 MHz */
	95	if (priv->can.clock.freq > 10000000) {
	96	priv->cpu_interface \|= CPUIF_DSC;
	97	priv->can.clock.freq /= 2;
	98	}
	99
	100	/* The memory clock may not exceed 8 MHz */
	101	if (priv->can.clock.freq > 8000000)
	102	priv->cpu_interface \|= CPUIF_DMC;
	103
	104	if (of_get_property(np, "bosch,divide-memory-clock", NULL))
	105	priv->cpu_interface \|= CPUIF_DMC;
	106	if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
	107	priv->cpu_interface \|= CPUIF_MUX;
	108
	109	if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
	110	priv->bus_config \|= BUSCFG_CBY;
	111	if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
	112	priv->bus_config \|= BUSCFG_DR0;
	113	if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
	114	priv->bus_config \|= BUSCFG_DR1;
	115	if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
	116	priv->bus_config \|= BUSCFG_DT1;
	117	if (of_get_property(np, "bosch,polarity-dominant", NULL))
	118	priv->bus_config \|= BUSCFG_POL;
	119
	120	prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
	121	if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
	122	u32 cdv = clkext / *prop;
	123	int slew;
	124
	125	if (cdv > 0 && cdv < 16) {
	126	priv->cpu_interface \|= CPUIF_CEN;
	127	priv->clkout \|= (cdv - 1) & CLKOUT_CD_MASK;
	128
	129	prop = of_get_property(np, "bosch,slew-rate",
	130	&prop_size);
	131	if (prop && (prop_size == sizeof(u32))) {
	132	slew = *prop;
	133	} else {
	134	/* Determine default slew rate */
	135	slew = (CLKOUT_SL_MASK >>
	136	CLKOUT_SL_SHIFT) -
	137	((cdv * clkext - 1) / 8000000);
	138	if (slew < 0)
	139	slew = 0;
	140	}
	141	priv->clkout \|= (slew << CLKOUT_SL_SHIFT) &
	142	CLKOUT_SL_MASK;
	143	} else {
144	dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
145	}
146	}
147
148	return 0;
149	}
150
3c8ac0f2	151	static int cc770_get_platform_data(struct platform_device *pdev,
1dd06ae8	152	struct cc770_priv *priv)
e285e44d WG	153	{
e285e44d WG	154
e19f0305	155	struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev);
e285e44d WG	156
e285e44d WG	157	priv->can.clock.freq = pdata->osc_freq;
dc605dbd	158	if (priv->cpu_interface & CPUIF_DSC)
e285e44d WG	159	priv->can.clock.freq /= 2;
	160	priv->clkout = pdata->cor;
	161	priv->bus_config = pdata->bcr;
	162	priv->cpu_interface = pdata->cir;
	163
	164	return 0;
	165	}
	166
3c8ac0f2	167	static int cc770_platform_probe(struct platform_device *pdev)
e285e44d WG	168	{
	169	struct net_device *dev;
	170	struct cc770_priv *priv;
	171	struct resource *mem;
	172	resource_size_t mem_size;
	173	void __iomem *base;
	174	int err, irq;
	175
	176	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	177	irq = platform_get_irq(pdev, 0);
	178	if (!mem \|\| irq <= 0)
	179	return -ENODEV;
	180
	181	mem_size = resource_size(mem);
	182	if (!request_mem_region(mem->start, mem_size, pdev->name))
	183	return -EBUSY;
	184
	185	base = ioremap(mem->start, mem_size);
	186	if (!base) {
	187	err = -ENOMEM;
	188	goto exit_release_mem;
	189	}
	190
	191	dev = alloc_cc770dev(0);
	192	if (!dev) {
	193	err = -ENOMEM;
	194	goto exit_unmap_mem;
	195	}
	196
	197	dev->irq = irq;
	198	priv = netdev_priv(dev);
	199	priv->read_reg = cc770_platform_read_reg;
	200	priv->write_reg = cc770_platform_write_reg;
	201	priv->irq_flags = IRQF_SHARED;
	202	priv->reg_base = base;
	203
	204	if (pdev->dev.of_node)
	205	err = cc770_get_of_node_data(pdev, priv);
e19f0305	206	else if (dev_get_platdata(&pdev->dev))
e285e44d WG	207	err = cc770_get_platform_data(pdev, priv);
	208	else
	209	err = -ENODEV;
	210	if (err)
	211	goto exit_free_cc770;
	212
	213	dev_dbg(&pdev->dev,
	214	"reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
	215	"bus_config=0x%02x clkout=0x%02x\n",
	216	priv->reg_base, dev->irq, priv->can.clock.freq,
	217	priv->cpu_interface, priv->bus_config, priv->clkout);
	218
00e4bbc8	219	platform_set_drvdata(pdev, dev);
e285e44d WG	220	SET_NETDEV_DEV(dev, &pdev->dev);
	221
	222	err = register_cc770dev(dev);
	223	if (err) {
	224	dev_err(&pdev->dev,
	225	"couldn't register CC700 device (err=%d)\n", err);
	226	goto exit_free_cc770;
	227	}
	228
	229	return 0;
	230
	231	exit_free_cc770:
	232	free_cc770dev(dev);
	233	exit_unmap_mem:
	234	iounmap(base);
	235	exit_release_mem:
	236	release_mem_region(mem->start, mem_size);
	237
	238	return err;
	239	}
	240
3c8ac0f2	241	static int cc770_platform_remove(struct platform_device *pdev)
e285e44d	242	{
00e4bbc8	243	struct net_device *dev = platform_get_drvdata(pdev);
e285e44d WG	244	struct cc770_priv *priv = netdev_priv(dev);
	245	struct resource *mem;
	246
	247	unregister_cc770dev(dev);
	248	iounmap(priv->reg_base);
	249	free_cc770dev(dev);
	250
	251	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	252	release_mem_region(mem->start, resource_size(mem));
	253
	254	return 0;
	255	}
	256
486e9570	257	static const struct of_device_id cc770_platform_table[] = {
e285e44d WG	258	{.compatible = "bosch,cc770"}, /* CC770 from Bosch */
	259	{.compatible = "intc,82527"}, /* AN82527 from Intel CP */
	260	{},
	261	};
f190a50c	262	MODULE_DEVICE_TABLE(of, cc770_platform_table);
e285e44d WG	263
	264	static struct platform_driver cc770_platform_driver = {
	265	.driver = {
	266	.name = DRV_NAME,
e285e44d WG	267	.of_match_table = cc770_platform_table,
	268	},
	269	.probe = cc770_platform_probe,
3c8ac0f2	270	.remove = cc770_platform_remove,
e285e44d WG	271	};
	272
	273	module_platform_driver(cc770_platform_driver);